matrix.h

/* *************************************************************************
                            matrix.h  -  description
                             -------------------
    begin                : Wed Oct 16 2002    
    copyright            : (C) 2002 by Micha Riser
    email                : mriser@gmx.net

    $Id: matrix_8h-source.html,v 1.1 2005/02/04 21:02:27 micha Exp $
    
 ************************************************************************* */

/* *************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ************************************************************************* */

#ifndef MATRIX_H
#define MATRIX_H

#include<cmath>
#include<cstring>
#include "types.h"

class Vector3;

class Matrix {

public: // Constructors and destructor

    Matrix() {}
    
    Matrix(DBL d[3][3]) {memcpy(&d,&a,sizeof(a));}

    Matrix(int d) {memset(&a,d,sizeof(DBL)*3*3);}

public: // Public methods

    DBL& operator() (int i, int j) {return a[i][j];}

    const DBL& operator() (int i, int j) const {return a[i][j];}
    
    void zero() {memset(&a,0,sizeof(DBL)*3*3);}

    void transpose();

    bool invert();

    void applyFromLeft(const Matrix &m);

public: // Static methods
    static Matrix generateScaleMatrix(const Vector3& v);

    static Matrix generateRotationMatrix(const Vector3& v);

private: // Private attributes
    static const DBL SMALL_DET;
    DBL a[3][3];
        
};

#endif

---